BASIC ELETRICAL ENGINEERING & ELECTRONICS
FILL IN THE BLANKS:
1. If your resistors each having value of R, are connected in parallel then the overall value of the combination will be R/4
2. Power dissipation in a resistive load would be . R.I2
3. In resistance colour code the Gold band indicates a tolerance of .. 5%
4. Rectification efficiency of Fullwave bridge rectifier is . 81.2%
5. Unit of Inductor is Henry
6. When two capacitors C1 and C2 are connected in parallel total capacitance is . .. C=C1+C2
7. Diode is an electronic circuit is used for .. Detection
8. Solder wire is an alloy of . Tin-lead
9. Majority carrier in N type semiconductor are Electrons
10. Alpha of a transistor is always .. Lessthan one
11. The maximum efficiency of a fullwave rectifier is 81.2%
12. One Pico equal to .. XL=XC
13. The unit of power ratio is Decibel
14. In resistance colour code the silver band indicates a tolerance of .. 10%
15. The process of adding impurities to a pure semiconductor is known as . Doping
16. The process of making DC from AC is known as .. Rectification
17. The resistance of the wire is proportional to its cross sectional area of the wire/conductor. Inversely
18. The junction break down voltage for Silicon diode is 0.7 Volt
19. The junction break down voltage for Germanium diode is 0.3 Volt
20. Ripple factor of Fullwave bridge rectifier is . 0.482
21. FET is a device Unipolar
22. A device whose characteristics are very close to that of an ideal voltage source is a .. Zener diode
23. A device whose characteristics are very close to that of an ideal current source is a .. Transistor in common-base mode
24. An ideal current source is one whose internal resistance is Infinite
25. Peak inverse voltage of Full wave rectifier is . 2Vm
26. An ideal current source is one which has very low internal resistance
27. The electrons in the outermost orbit are called .. electrons. Valance
28. The larger the orbit, the is the energy of the electron. Greater
29. The merging of a free electrons and a hole is called . Bonds. Recombination
30. Ripple factor of Fullwave rectifier is . 0.482
31. A semiconductor that is electrically . neutral
32. A pure germanium crystal is an .. semiconductor. Intrinsic
33. Peak inverse voltage of half wave rectifier is . Vm
34. Ripple factor of halfwave rectifier is . 1.21
35. Rectification efficiency of halfwave rectifier is . 40.6%
36. RMS value of halfwave rectifier is Im/?
37. .. is a solid-state device FET
38. The term IC, as used in electronics, denotes Integrated circuits
39. When a forward bias is applied to a junction diode, it decreases . Potential barrier
40. ..diode has a sharp breakdown at low reverse voltage. Zener diode
41. A transistor is said to be in a quiescent state when .. No signal is applied to the input
42. The operation of a JFET involves a flow of majority carriers
43. In an amplifier, the coupling capacitors are used to prevent .. DC mixing with input or output
44. The coupling capacitor mainly affect ..Cutoff frequency of an amplifier. Lower
45. The output voltage waveform of CE amplifier is with its input voltage wave. Out of phase
46. The output Current waveform of CE amplifier is with its input current wave. In phase
47. For a good voltage amplifier, its input impedance should be .. . compared to the resistance of the source. High
48. The power gain of an amplifier is X and its voltage gain is Y,then its current gain wil be X/Y
49. An amplifier circuit of voltage gain 100,gates 2 V output. The value of input voltage is .. 50 V
50. The video signal in TV is transmitted by .. modulation scheme. AM
51. A circuit converts DC to AC Oscillator
52. A normally used as voltage regulator. Zener
53. Ratio of RMS value to average value is Form factor
54. The heart of CRO is . CRT
55. The value of resistor with colour bands yellow, Violet, Orange and gold is .. 47K ? 5%
56. At resonance frequency of a series resonance circuit is 1/2??LC
57. The algebaic sum of currents at anode of a network is Zero
58. Unit of magnetic flux is .. Weber
59. In CRO X-axis normally represents .. Time
TRUE OR FALSE:
1. The colour system of TV used in India is SECAM. False
2. In pure inductive load current lags voltage by 90 0 True
3. Zener uses reverse voltage. True
4. Semiconductor in its purest form is called extrinsic semiconductor. False
5. A practical current source has low internal resistance False
6. The mutual conductance of a pentrode tube is of the same order as that of a triode. True
7. The space charge formed around the cathode of a vacuum tube is negative. True
8. An ideal current source has low internal resistance False
9. The IF of AM is 455KHz True
10. Tuned voltage amplifiers are not used in public-address system True
11. An ideal voltage source has low internal resistance False
12. The heart of CRO is CRT True
13. The value of resistor with colour bands yellow, Violet and gold is 4.7 True
14. An ideal voltage source has zero internal resistance True
15. The value of resistor with colour bands Brown,Black and Brown 100 True
16. An ideal current source has infinite internal resistance True
17. The dc collector current in a transistor circuit is limited by the junction capacitance. False
18. Negative dc feedback through RE is responsible for the stabilization of the operating point in a potential-divider bias circuit. True
19. Negative feedback in an amplifier increases the stability of its voltage gain. True
20. Negative feedback in an amplifier raises the lower cut-off frequency of the amplifier. False
21. Negative feedback in an amplifier raises the upper cut-off frequency of the amplifier. True
22. Oscillator use negative feedback False
23. A UJT has two bases and one emitter. True
24. A rectifier always need 4 diodes False
25. The capacitor block DC True
26. A inductor allows DC and block AC True
27. FET is a Unipolar device True
28. Amount of negative feedback it is possible to convert an amplifier into an oscillator. False
29. An audio signal generator is meant to produce sinusoidal voltages of frequencies varying from 20 Hz to 40 MHz. False
30. A wein bridge oscillator generates oscillations only if the gain of the two-stage amplifier is more than 3. True
31. For oscillations to start, the loop gain A? of the oscillator must be greater than unity initially. True
32. An oscillator circuit is merely a dc-to-ac converter. True
33. An RFC permits an easy flow of dc current and at the same time it offers very high impedance to high frequency currents. True
34. Emitter follower is an amplifier with positive feedback. False
35. Input impedance of an emitter follower is low and its output impedance is high. False
36. Emitter follower is the same as a common-base amplifier circuit. False
37. The output of an astable multivibrator is always a symmetrical square wave. False
38. The RF signal generator used in laboratories makes use of a crystal oscillator. False
39. A Hartley oscillator uses a split-tank False
40. Typically, the amplification factor of a triode is about 10,000. False
41. The cathode of a Thermionic tube is always heated by passing an electric current True
42. The plate ac resistance of a pentode is of the order of 10 K? False
43. A pure germanium crystal is an extrinsic semiconductor. False
44. An increase in the negative potential on a control grid of a triode tube reduces the anode current. True
45. If of FM is 455 kHz False
46. The peak inverse voltage of full wave rectifier is Vm False
47. GaAsP is used to make LED True
48. The turn-on voltage of a Ge junction diode is 0.7 Volt. True
49. A PIN diode is frequently used as a switching diode. True
50. A class- C amplifier is used as a RF amplifier. True
51. CE configuration has high input impedance. True
52. Class C amplifier has least distortion. True
53. In a bridge rectifier two diodes conducts at a time True
54. LCD and LED working are same False
55. To create a N-type semiconductor we use Aluminium True
56. FETs and Transistors are active components, which have the ability to produce gain. True
57. An integrated electronic circuit is fabricated on a tiny silicon chip. True
58. A series resonant circuit is also called as an acceptor circuit True
59. The ripple frequency of half wave-rectified signal is half the input frequency. False
60. The process of making Dc from AC known as Rectification. True
SHORT QUESTIONS:
1. Explain Paper Capacitor and Ceramic Capacitor.
2. Explain the colour coding of a resistor.
3. Explain electrolytic capacitors and Variable capacitors.
4. Explain the working of a single tuned amplifier.
5. What is a capacitor? Explain the colour coding of a Capacitor
6. What are the different types of transistors? Explain.
7. Explain Average value, RMS value and Phase.
8. Compare AM and FM
9. Explain Ohms law.
10. Explain the concept of voltage and current source in electronics.
11. Explain the working of RLC series circuit.
12. Explain ? Filter.
13. Explain different classifications of amplifiers.
14. Explain Signal diode and Varactor Diode.
15. What is a bleeder resistor? What function can it serve in a power supply?
16. Explain the working of RL series circuit.
17. Explain Zener diodes and Photodiodes.
18. Draw the circuit of RC coupled amplifier.
19. Explain the working of RC series circuit.
20. Explain common-Emitter configuration.
21. Explain the basic principle used in AVO meter and explain how they are used to measure voltage, Current, resistance.
22. Explain P-type semiconductor?
23. Explain the colour coding used in resistors and capacitors.
24. What are the different types of Resistors? Explain.
25. What do you mean by thermal run away?
26. Explain the terms Frequency, Period.
27. How Frequency and phase can be measured using CRO?
28. Explain Diodes and LEDs
29. Write down the seven base units in SI units.
30. Explain any 3 passive components.
31. Draw a three phase system and explain.
32. Explain JFET.
33. Explain between voltage amplifier and power amplifier.
34. Explain Field-Effect Transistor.
35. Explain series Inductor Filter.
36. Explain series resonance circuit.
37. Explain Parallel resonance circuit.
38. With neat diagrams explain the working of Bridge rectifier.
39. Explain RC oscillators.
40. Explain different classification of Oscillators.
41. Explain LC oscillators.
42. Explain Hartley oscillators.
43. Explain the frequency response curve of a RC-coupled amplifier.
44. Explain why common Emitter configuration is widely used in amplifier circuits.
45. Explain common-base configuration.
46. Why we are still using Vacuum diodes?
47. Explain resistor,capacitor and Inductor.
48. Explain what is the need for biasing?
49. Explain different biasing circuits.
50. Explain Colpitts oscillators.
51. Why class-B and class-C operation is more efficient than class-A.
52. Explain single stage transistor amplifier.
53. Explain push- pull amplifier.
54. Explain the advantages of push-pull amplifier.
55. Compare transistor and tube amplifier.
56. Explain resistance-capacitance coupling.
57. What is meant by Alpha and Beta for a transistor and what is the relationship between them.
58. Explain Crystal oscillators.
59. Explain Astable Multivbrator.
60. Explain N-type semiconductor?
ESSAYS:
1. Explain Rectifiers
2. Explain different types of diodes.
3. Explain Chock-Input LC Filter.
4. Explain different types of capacitors.
5. Explain Intrinsic and extrinsic semiconductors?
6. Explain N-type and P-type semiconductors?
7. Define all-important parameters of a JFET.
8. Explain different distortions in amplifiers.
9. Explain single tuned voltage amplifier.
10. What is an emitter follower? What is its important application?
11. Explain the working of a Double tuned amplifier.
12. Explain why a pentavalent impurity atom is known as donor-type impurity.
13. With neat diagrams explain the working of full wave rectifier.
14. What is an Inductor? Give some important applications of inductors.
15. Explain Complementary Symmetry push- pull amplifier.
16. Explain Multivbrators.
17. Explain three configurations.
18. Explain the working of a transistor.
19. Explain Voltage Divider Biasing Circuit.
20. Explain Transformer coupling.
21. With neat diagrams explain the working of Half wave rectifier.
22. Explain in detail with necessary diagrams the working of a Cathode Ray Tube.
23. How negative feedback is more advantageous.
24. Explain oscillators.
25. Why voltage amplifier cannot work as a power amplifier.
26. Explain the VI characteristics of a PN Junction Diode.
27. Harmonic distortion is also called nonlinear distortion. Why?
28. Explain how to avoid power loss in RC.
29. Explain Direct coupling.
30. Explain full wave rectifier with neat diagram.
31. Explain Phase-Shift oscillators.
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